In the late 1970s I discovered a secret ancient process that I applied
to all my monkey coffins with great success, but at a great price..the
smell.

What I discovered is that if I coated the inside of speaker boxes with
a thin layer of modeling clay, and if I filled in all of the corners with
molding clay and molded the clay so that there were smooth transition
from wall to wall, and if I covered the speaker magnets with clay....a
quantum of harmonic discombobularity disappeared. Modeling clay is great
stuff, stick very easily to wood when it is applied warm, but to use it
you must heat it up and that means putting it in a pot on your stove and
we are now talking about a major stink that permeates your home. But
that was before micro-wave ovens.

I have used modeling clay as a dampening compound with great success
in my Tannoy horns, and that includes using it to remove all sharp bends,
and to coat all of the surfaces of the walls where sound reflects off
the driver. The magnet structure of the speaker is also heavily packed
with modeling clay. What is the secret of doing this and still living
in your home? Put the modeling clay in Zip Loc bag and then put it in
your microwave oven and cook it until it is nice a soft and easily used.
No smell!

It does take work to apply the warm clay properly but I know you can
channel Michaelangelo and will enjoy the sometimes time consuming application.
Dont overuse it on the walls of your speaker, and it is great
fun to fill in all of the corners and perpendicular joinings of walls
so that your speaker cabinet has nothing but smooth organic shapes. Use
a big soup spoon to help you smooth the clay

The benefit of this process is you can quickly reverse it with no
harm. There is a slight smell for a couple of days, but that will
quickly go away and until that time your home will smell like a sculptures
studio.

And yes there is a benefit in applying and modeling the clay to the front
of your speaker baffle, but you can imagine what that looks like.

Remember you are buying modeling clay from your local art supply
store and not the clay that hardens permanently.

A confession: I also used modeling clay as a dampening compound on my
turntable bases and platters.